Been playing around with speaker placement, speaker isolation and DAC operating system firmware today. A bit of audiophile fun with good results.
Listened to:
Lou Donaldson "The Scorpion: Live at the Cadillac Club" Blue Note Rare Groove series cd

and
Bob Dylan Blood on the Tracks "Test Pressing" RSD LP

and
Duke Ellington "Ellington Indigos" Columbia mono LP

finally, this excellent cd
Helen Merrill "You and the Night and the Music" Gitanes Jazz cd

Ended up with my speakers sitting directly on PS Audio PowerBases with zero toe-in as the best sound, and with DAC firmware 3.06. Really enjoying the sound.